The effect of Hf and Ti additions on microstructure and properties of Cr2Nb–Nb in situ composites
| Autor: | M. R. Jackson, B.P. Bewlay |
|---|---|
| Rok vydání: | 1996 |
| Předmět: |
Materials science
Yield (engineering) Mechanical Engineering Composite number Niobium chemistry.chemical_element Laves phase Condensed Matter Physics Microstructure chemistry.chemical_compound chemistry Mechanics of Materials Ultimate tensile strength Silicide General Materials Science Composite material Eutectic system |
| Zdroj: | Journal of Materials Research. 11:1917-1922 |
| ISSN: | 2044-5326 0884-2914 |
| Popis: | The present paper describes the effect of Hf and Ti additions on the microstructures and mechanical properties of two-phase composites based on the Cr2Nb–Nb eutectic. The microstructures of directionally solidified in situ composites containing 50–70% by volume of the Laves phase Cr2Nb which was modified with Hf (7.5–9.2%) and Ti (16.5–26%) are described. Partitioning of Hf and Ti between the two phases is discussed using microprobe and EDS results. The tensile properties at 1100 and 1200 °C are described and compared with those of an analogous niobium silicide-based composite. The Cr2(Nb)–(Nb) composite tensile yield strengths at 1200 °C were increased over that of monolithic Cr2Nb to ∼130 MPa. However, at 1200 °C the yield strengths of the silicide-based composites were approximately twice those of the Cr2(Nb)–(Nb) composites. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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